Tapered roller bearings

For Double-row taper roller bearings, the contact angle determines the axial bearing capacity. The larger the angle value, the greater the axial bearing capacity. It is mainly used to withstand radial and axial combination loads based on radial loads and can withstand two-way axial loads.

• Two basic double-row taper roller bearing styles exist: the two-row converging TDI configuration and the two-row diverging TDO configuration.

• Depending on the application, these bearings are made using high chrome through hardening or case-hardened carburizing alloy steels. The cages for FV double-row taper roller bearings are stamped pressed steel, and a steel pin-type cage is also available, which allows a larger complement of rollers for higher capacity.

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• This style of bearing set simplifies design and reduces the danger of bearing clearance changes due to axial shaft expansion. Therefore, defining the proper internal play related to the application is important.

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• TDI designs:

• TDI design have a double cone assembly and two single cups, and they are generally supplied with a cup spacer. The cup spacer of each bearing is face ground after accurately measuring the distance between adjacent cup faces to obtain a predetermined internal play. Consequently, spacers or components may not be interchanged. An annular groove and lubrication holes are included in the spacer. The contact angle converges, so using these bearings will not appreciably increase the rigidity of the shaft mounting. FV also produces the taper roller steep contact angle TDIS version with higher thrust capacity (while the radial one is reduced) than the TDI type, normally used as backup thrust bearings in rolling mills. These TDIS bearings combine face slots (e.g., N, N1, N2, etc.) and bore key-way for locking the cone on the shaft. Also, helical grooves in the bore and lubrication grooves in the side faces of double cone and retention sleeves with annular grooves and lubrication holes can be provided.

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• TDO design:

• FV bearings in TDO configuration have a double cup and two single cone assemblies and can be supplied with a shaft-supported cone spacer. 

• The spacer for individual cones faces the ground to obtain the desired internal play for the assembly. So, also, in this case, spacers and components may not be interchanged. An annular groove and oil holes are included in the cone spacer.

• The TDO style bearings are mainly used in a floating cup mounting. So, the counterbored hole in the cup is for a drilled dowel pin, which prevents the rotation of the loosely fitted double cup. Additional features of a lubrication groove and oil holes in the double cup for simplified lubrication through the outer ring are included (suffix CD). However, this bearing style is usually lubricated through the shaft using oil holes and a groove in the cone spacer.

• In the TDO type, the contact angle diverges, so the rigidity of the shaft mounting is increased to resist overturning moments.

• Bearing sets with steep contact angle and intermediate ring, pierced rollers and steel pin-type cage (TDOS design), bearing sets with extended inner rings which abut each other (TDONA and TDONASW designs), bearing sets with heavy wall cup (TNASWH design) and bearing sets with shields of pressed steel (TDO 4422 design) are also in FV manufacturing program. 

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• Most TDI and TDO double-row taper roller bearings are produced with inch dimensions as per American AFBMA 19/1974. As per FV standard practice, dimensional and running accuracy grade is by class 2 or 4.

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• Double-row taper roller bearings have some unique characteristics

• High carrying capacity

• Due to the large number of rollers, the double-row taper roller bearings have higher carrying capacity and can withstand larger radial and axial loads.

• High-rigidity

• The angle of the inner and outer rollers of the double-column cone roller bearings is the same, so it has high rigidity and can withstand larger bending and twisting forces.

• High-precision

• The inner and outer rings of the double-row taper roller bearings are precisely processed, and the number of contact points between the roller and the roller roads is greater. Therefore, it has high precision and can meet the requirements of high-precision machine tools and precision instruments.

• Can withstand heavy composite (radial and axial) load, strong rigidity. Axial fixation can be fixed in both directions with a certain axial gap or preload.

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• The material for Double-row tapered roller bearing 

• The material choice of the double-row taper roller bearings is very important because the material of the bearings directly affects its performance and life.

• The materials that can be chosen include GCR15, GCR15Simn, GCR18MO, and carburizing steel. These steels have good hardening and abrasion resistance.

• For large-sized four-row taper roller bearings, FV Bearing will also use imported carburizing steel according to the actual working conditions of the customer, such as Timken 33311 from the United States, carburizing steel from European OVAKO.

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• Delivery period of Double-row tapered roller bearing

• According to different materials, the delivery period of the double-row taper roller bearings is different.

• If choose material GCR15, GCR15SIMN, GCR18MO, the delivery period is 35-40 days

• If the chosen material, carburizing steel, is used, the delivery period is 80-90 days.

• Application of Double-row tapered roller bearing

• Double-row tapered roller bearings are also widely used, mainly including:

• Heavy machinery and equipment, such as bridge cranes, extrusion machines, mining equipment, etc.

• Equipment with high requirements, such as CNC machine tools, precision instruments, etc.

• In these devices, double-row tapered roller bearings can bear combined radial and axial loads and have the characteristics of high precision and high rigidity, which can ensure the stable operation of mechanical equipment and improve the operating efficiency of equipment.

• The TDO models list of FV can provide:

• Models	Dimension				Basic load rating		Design types and features
  					Dynamic	Static
  	d[mm]	D[mm]	T[mm]	B[mm]	C[kN]	C0[kN]
  331945	228.6	488.95	254	152.4	3 143	4 500	TDO/D
  BT2B 328130	260	480	284	220	4 330	7 350	TDO
  BT2B 332504/HA2	300.038	422.275	174.625	136.525	2 177	4 750	TDO/XDC
  BT2B 332830	340	460	160	128	2 196	4 900	TDO/D
  BT2B 332831	360	480	160	128	2 211	5 000	TDO/D
  BT2B 332603/HA1	368.249	523.875	214.312	169.862	3 380	7 500	TDO/D
  331197 A	384.175	546.1	222.25	177.8	3 724	8 300	TDO/D
  BT2-8143/HA1	400	540	170	135	2 782	6 300	TDO/D
  331656	415.925	590.55	244.475	193.675	4 175	9 650	TDO/XDC
  BT2B 332604/HA1	431.8	571.5	155.575	111.125	1 980	5 100	TDO/D
  331657	479.425	679.45	276.225	222.25	5 010	12 700	TDO/XDC
  331605 B	498.475	634.873	177.8	142.875	2 750	7 350	TDO/XDC
  BT2B 332605 A/HA1	501.65	711.2	292.1	231.775	5 500	13 700	TDO/XDC
  BT2B 332446	536.575	761.873	311.15	247.65	6 270	16 000	TDO/DC
  331640 A	558.8	736.6	225.425	177.8	4 290	11 600	TDO/DC
  BT2B 328028/HA1	711.2	914.4	190.5	139.7	3 800	9 650	TDO/D
  331554 A	723.9	914.4	187.325	139.7	3 800	9 650	TDO/D3
  BT2B 331554 B/HA1	723.9	914.4	187.325	139.7	3 800	9 650	TDO/D3
  BT2B 332501/HA5	914.4	1 066.8	139.7	101.6	2 600	8 000	TDO.1/D
  BT2B 332780/HA5	1 160	1 540	400	290	14 200	38 000	TDO.1/D

• The TDI models list of FV can provide:

• Models	Dimension				Basic load rating		Design types and features
  					Dynamic	Static
  	d[mm]	D[mm]	T[mm]	B[mm]	C[kN]	C0[kN]
  BT2B 332931	240	480	220	200	3 615	5 500	TDI/WIY2
  332168	300	440	105	105	1 076	2 040	TDIS/NY
  BT2B 332685/HA1	303.212	495.3	263.525	263.525	4 919	9 800	TDIT/Y2
  332068	305.033	560	200	200	2 920	5 300	TDIS/N2Y
  332169 A	305.07	500	200	200	2 734	5 200	TDIS/N
  332169 AA	305.07	500	200	200	2 734	5 200	TDIS/NY
  BT2B 334110/HA3	305.07	0	200	200	2 734	5 200	TDIS.2/N
  BT2B 328695 A/HA1	333.375	469.9	166.688	166.688	2 642	5 700	TDIT/Y2
  331527 C	346.075	488.95	174.625	174.625	2 835	6 300	TDI/WIY2
  BT2B 332913/HB1	346.075	488.95	104.775	95.25	1 170	2 750	TDI/Y2
  BT2-8009/HA3	380	560	200	200	2 991	6 550	TDIS/NY
  331158 A	384.175	546.1	193.675	193.675	3 724	8 300	TDI/GWIY2
  BT2B 331837	384.175	546.1	193.675	193.675	3 724	8 300	TDI/Y2
  BT2B 328035/HA1	385.762	514.35	152.4	152.4	2 290	6 000	TDI/GWIY2
  BT2B 328934/HA3	390	690	200	200	2 967	6 550	TDIS.2/N
  BT2B 334045/HA3	390	568	180	180	2 550	5 850	TDIS.2/N1
  332167	400	650	240	240	3 910	8 150	TDIS/N2Y
  BT2B 332167 DA/HA1	400	650	240	240	3 910	8 150
  BT2B 331840 C/HA1	406.4	546.1	138.113	138.113	2 339	5 100	TDI/WIY2
  BT2B 334085 A/HA1VA928	406.4	580	164.275	164.275	1 973	4 250	TDIS.2/N1V
  BT2B 328283/HA1	415.925	590.55	209.55	209.55	4 175	9 650	TDIT/Y2
  BT2-8016/HA3	420	0	200	200	2 970	7 200	TDIS.2/N2
  BT2B 334113/HA3VA901	445	620	180	180	2 120	5 100	TDIS.2/NV
  BT2B 332911 C/HA1	447.675	635	223.838	223.838	4 400	11 000	TDIT/Y2
  BT2B 328523/HA1	450	595	178	178	3 169	8 150	TDI/WIY2
  BT2B 334030/HA1	460	9 999	180	180	3 140	6 950	TDIS.2/N1
  BT2-8215	464	615	150	136	2 160	5 850	TDI
  BT2B 334112/HA3	482	0	160	160	1 760	5 200	TDIS.2/N
  BT2-8142/HA3	482.6	733.425	190	190	2 860	8 300	TDIS/NY
  BT2B 331848	489.026	634.873	152.4	152.4	2 750	7 350	TDI/Y2
  331676 A	500	730	280	280	6 600	16 000	TDI.1/Y2
  331182 A	501.65	711.2	250.825	250.825	5 500	13 700	TDI/GWIY2
  BT2B 332662 B/HB1	519.113	736.6	258.762	258.762	6 050	15 600	TDI/Y2
  BT2B 332662/HB1	519.113	736.6	258.762	258.762	6 050	15 600	TDI/Y2
  331607 B	558.8	736.6	196.85	196.85	4 290	11 600	TDI/Y2
  BT2B 332626/HA7	560	820	242	242	5 010	11 400	TDI.1/Y2
  BT2B 331476 AG/HA1	571.5	812.8	285.75	285.75	7 210	18 000	TDI/GWIY2
  BT2B 331854 C/HA1	571.5	812.8	285.75	285.75	7 210	18 000	TDI/Y2
  BT2B 331854/HA1	571.5	812.8	285.75	285.75	7 210	18 000	TDI/Y2
  331677	580	830	280	280	6 820	16 600	TDI.1/Y2
  BT2B 332424/HA3	609.6	820	171.45	171.45	4 020	10 600	TDI/GWIY2
  331555 B	635	939.8	304.8	304.8	6 710	16 600	TDIS/N1Y
  BT2B 328306/HA4	650	1 030	270	270	8 800	18 300	TDI.1/Y2
  BT2-8164/HA4	690	980	355	355	10 227	25 000	TDI/Y2